Allocated but unannounced space
Every block here was allocated or assigned by a regional internet registry, and none of them appeared in any routing table we collected at our last snapshot — neither as a route of their own, nor covered by a larger announcement, nor carved up into more specifics.
“Unannounced” does not mean “unused”
Plenty of allocated space is deliberately kept off the public internet: private interconnects, lab and lawful-intercept ranges, networks reachable only inside one operator, and space held in reserve. Some of it is announced somewhere our collectors cannot see, which is a limit of our vantage points rather than a fact about the block.
It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today. Nothing on this page means a block is unallocated, available, or free to announce.
Browse by registry
Browse by country
Countries with unannounced space registered through RIPE NCC, largest first.
Unannounced blocks registered through RIPE NCC
24,902 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 163.115.128.0/18 | 16.4k | RIPE NCC |  FR | 1st Apr 2005 |
| 163.115.192.0/18 | 16.4k | RIPE NCC | FR | 1st Apr 2005 |
| 163.163.0.0/16 | 65.5k | RIPE NCC |  BE | 27th Aug 1992 |
| 163.168.0.0/16 | 65.5k | RIPE NCC |  CH | 7th Sept 1992 |
| 163.169.0.0/16 | 65.5k | RIPE NCC |  GB | 8th Sept 1992 |
| 163.175.0.0/16 | 65.5k | RIPE NCC |  NL | 26th Oct 1992 |
| 163.242.0.0/16 | 65.5k | RIPE NCC |  DE | 1st Sept 1993 |
| 163.64.0.0/15 | 131k | RIPE NCC | FR | 1st Apr 2005 |
| 163.67.0.0/16 | 65.5k | RIPE NCC | FR | 1st Apr 2005 |
| 163.70.0.0/17 | 32.8k | RIPE NCC | FR | 1st Apr 2005 |
| 163.71.0.0/16 | 65.5k | RIPE NCC | FR | 1st Apr 2005 |
| 163.72.0.0/16 | 65.5k | RIPE NCC | FR | 1st Apr 2005 |
| 163.76.0.0/17 | 32.8k | RIPE NCC | FR | 1st Apr 2005 |
| 163.77.0.0/17 | 32.8k | RIPE NCC | FR | 1st Apr 2005 |
| 163.78.0.0/16 | 65.5k | RIPE NCC | FR | 1st Apr 2005 |
| 163.79.0.0/17 | 32.8k | RIPE NCC | FR | 1st Apr 2005 |
| 163.80.0.0/12 | 1M | RIPE NCC | FR | 1st Apr 2005 |
| 163.96.0.0/16 | 65.5k | RIPE NCC | FR | 1st Apr 2005 |
| 163.97.0.0/16 | 65.5k | RIPE NCC | FR | 1st Apr 2005 |
| 163.98.0.0/15 | 131k | RIPE NCC | FR | 1st Apr 2005 |
| 164.1.0.0/21 | 2k | RIPE NCC | FR | 18th Sept 1992 |
| 164.1.12.0/22 | 1k | RIPE NCC | FR | 18th Sept 1992 |
| 164.1.128.0/17 | 32.8k | RIPE NCC | FR | 18th Sept 1992 |
| 164.1.16.0/20 | 4.1k | RIPE NCC | FR | 18th Sept 1992 |
| 164.1.32.0/19 | 8.2k | RIPE NCC | FR | 18th Sept 1992 |
| 164.1.64.0/18 | 16.4k | RIPE NCC | FR | 18th Sept 1992 |
| 164.1.8.0/22 | 1k | RIPE NCC | FR | 18th Sept 1992 |
| 164.12.0.0/16 | 65.5k | RIPE NCC |  US | 2nd Nov 1992 |
| 164.13.0.0/16 | 65.5k | RIPE NCC |  FI | 4th Nov 1992 |
| 164.135.0.0/16 | 65.5k | RIPE NCC |  SE | 14th Oct 1993 |
| 164.138.202.0/24 | 256 | RIPE NCC |  IR | 10th Jul 2025 |
| 164.142.0.0/16 | 65.5k | RIPE NCC |  IT | 18th Feb 1994 |
| 164.153.24.0/22 | 1k | RIPE NCC | GB | 14th Feb 2019 |
| 164.177.184.0/21 | 2k | RIPE NCC | US | 21st Nov 2011 |
| 164.34.0.0/16 | 65.5k | RIPE NCC | DE | 22nd Sept 1992 |
| 164.35.0.0/16 | 65.5k | RIPE NCC | BE | 20th Oct 1992 |
| 164.36.0.0/16 | 65.5k | RIPE NCC | GB | 23rd Nov 1992 |
| 164.37.32.0/22 | 1k | RIPE NCC | SE | 31st Jan 1993 |
| 164.37.36.0/23 | 512 | RIPE NCC | SE | 31st Jan 1993 |
| 164.37.40.0/24 | 256 | RIPE NCC |  IS | 31st Jan 1993 |
| 164.37.42.0/24 | 256 | RIPE NCC | DE | 31st Jan 1993 |
| 164.37.52.0/22 | 1k | RIPE NCC | DE | 31st Jan 1993 |
| 164.37.56.0/22 | 1k | RIPE NCC |  DK | 31st Jan 1993 |
| 164.37.60.0/23 | 512 | RIPE NCC | DE | 31st Jan 1993 |
| 164.37.63.0/24 | 256 | RIPE NCC |  RS | 31st Jan 1993 |
| 164.37.64.0/22 | 1k | RIPE NCC | SE | 31st Jan 1993 |
| 164.37.69.0/24 | 256 | RIPE NCC | SE | 31st Jan 1993 |
| 164.37.70.0/23 | 512 | RIPE NCC | SE | 31st Jan 1993 |
| 164.37.80.0/20 | 4.1k | RIPE NCC | SE | 31st Jan 1993 |
| 164.40.224.0/21 | 2k | RIPE NCC |  BA | 18th Nov 2011 |